Bhattacharya Shohini, Zheng Duxin, Zhou Jian
<a href="https://ror.org/05db1vq90">RIKEN BNL Research Center</a>, Brookhaven National Laboratory, Upton, New York 11973, USA.
<a href="https://ror.org/02n7p8p77">Shandong Institute of Advanced Technology</a>, Jinan, Shandong 250100, China.
Phys Rev Lett. 2024 Aug 2;133(5):051901. doi: 10.1103/PhysRevLett.133.051901.
We propose to detect signals from quark orbital angular momentum (OAM) through exclusive π^{0} production in electron- (longitudinally polarized) proton collisions. Our analysis demonstrates that the sin2ϕ azimuthal angular correlation between the transverse momentum of the scattered electron and the recoil proton serves as a sensitive probe of quark OAM. Additionally, we present a numerical estimate of the asymmetry associated with this correlation for the kinematics accessible at the Electron-Ion Colliders in the U.S. and China. This study aims to pave the way for the first experimental study of quark OAM in relation to the Jaffe-Manohar spin sum rule.
我们提议通过在电子（纵向极化）-质子碰撞中通过排他性的π⁰产生来探测来自夸克轨道角动量（OAM）的信号。我们的分析表明，散射电子的横向动量与反冲质子之间的sin2ϕ方位角关联可作为夸克OAM的灵敏探针。此外，我们针对美国和中国的电子-离子对撞机可及的运动学，给出了与这种关联相关的不对称性的数值估计。本研究旨在为关于夸克OAM与贾菲-马诺哈尔自旋求和规则相关的首次实验研究铺平道路。
